Best available copn



May 15, 1923.

H. H VICKERS COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Jan. 26, 1921 4 Sheets-Sheet 1 May 15, 1923. 1,455,280

'H. H. VICKERS COMBINED TYPEWRITING AND COMPUTING IACHINE Filed Jan. 26, 1921 4 Sheets-Sheet 2 May 15, 1923.

H. H. VICKERS COMBINED TYPEWHITING AND COMPUTING MACHINE Filed Jan. 26, 1921 4 Sheets-Sheet 5 May 15, 1923. 1,455,280

H. H VICH EFQS COMBINED TYPBWRITING AND COMPUTING MACHINE Filed Jan. 26, 1921 4 Sheets-Sheet 4 Af/onve? an elimination or error Patented May 15, 1923.

UNITED STATES PATENT OFFICE.

HARRY HJVICKERS, OF CORONA, NEW YORK. ASSIGNOR TO UNDERWOOD COMPUTING MACHINE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

COMBINED TYPEWRITING AND COMPUTING MACHINE.

Application filed January 26, 1921.

Te -all whom it may concern:

Be it known that I, HARRY lI. Viciusns, a citizenof the United States, residing in (lorona, Long Island, in the county of Queens and State of Ne'w'York, have invented certain newand useful Improvements in Conibined Typewriting and Computing Machines,-of which the following is a specification.

This inventionrelates to error-preventing means for combined typewriting and computing machines, andis in the nature of an improvement on the application of Henry L, Pitinan, Serial No. 418,913, filed October 23,1920. I

In machines ,of the Underwood-Hanson type, such as that disclosed in the above-mentioned application, index pins are set on denominationalba1s in accordance with the numeralkeys depressed, and the numbers so indexedare run lnt'o the register by a general operator which may be driven either-manually or by motor. The motor of a motordriven' machine may be thrown into action by a finger-piece near the front of the machine, or by one farther back, the latter also being actuable automatically by suitable means. .Snch machines are adapted to perform either addition or subtraction. VVhenever index pins are incorrectly set, it is desi'rable to restore such pins to normal position, arid to effect a correct setting of index pins before actuating the flgeneral operator. Such restoration may be e ected by means of key, and suitable means rendered effective thereby. Also, in such machines, provision is usually made of a clearance or star key, which, when the register or numeral wheels stand at zero, may be depressed to cause a star or other clearance sign to be printed on a worksheet in the machine.

The main object of the invention is to provide simple and eflicient means to prevent the erroncousactuation of various keys at the same time and to prevent interference between the different parts of the machine when actuated.

Another object of the invention is to pro \ide, for such purposes, mechanism easy and economical to manufacture and which may readily be applied to existing machines.

In carrying out the invention, provision may be made of means whereby depression of the error key will prevent actuation of the Serial No. 439,941.

general operator by either the usualmotorstarting key adjacent the keyboard or the slide through which the automatic starting of the motor is usually elfected. The means just referred to may also be adapted to'lock the error key in case either the motor-starting key or the slide is actuated.

IOVISlOIl may be made of means whereby depression of the error key will effect locking of the numeral keys, or depression of any one of the numeral keys will effect locking of the error key.

rovision may be made of means whereby depression of the error key will prevent printing of a clearance sign by. depression of the clearance key.

revision may be made whereby movement of the general operator from its normal position will cause the error key to be locked against depression.

Provision may also be made of means whereby depression of a numeral key will prevent actuation .of the clearance-signprinting mechanism by the clearance-key.

Further provision may be made whereby depression of the usual motor-starting key will prevent the operation of any one of the numeral keys, or actuation of any one of the numeral keys will prevent the operation of said usual motor-starting key.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

*igure 1 is a sectional side View, showing my invention applied to so much of an Underwood-Hanson typewriting and computing machine as is necessary for the purpose of illustration.

Figure 2 is a view partly ing part of the mechanism whereby restoration to normal position of depressed index pins is effected when the error key is depressed.

Figure 3 is a fragmentary view, showing the new structure.

Figure 4 is a View, showing certain of the parts in the positions assumed when a nu meral key is depressed.

Figure 5 is a detail View, showing certain of the parts in the same positions as in Figure 4.

Figure (3 is a view, showing certain oi the parts in the positions assumed when the motor-starting key near the front of the ma chine is depressed.

in section, showperspective till bers 18.

Figure 7 is a detail view, showing certain parts-in the srlnie positions as inFigure G,'the numeral keys being locked against depres sion.

Figure 8 is a view showing the positions assumed by certain parts upon depression of the error or elimination key, the numeral keys the elearanrekey, the motor-starting key and the motor-starting slide being locked against depression.

Figured) is a viewillustratingthe locking ofthe error key when thegeneral operator hasbeeu movedfrom its normal position.

Figure 10 is a detail view showing the manner in which the numeral keys are locked, dueto depression of the error key.

Upon actuation ot-a numeralkey 11, a pendant 'orlirik' 12 pivoted'thereto, will act on'an arm13 to rock-a shaft 14, on which said arm istixed. "Rocking of the shaft ll eflects,-li means of an arm'15 secured thereon, a pin-setting movement of a linkage harin'ga'lowerbarlli adapted to set pins 17'on selected pin-bars or denominational memltshonld be understood thatthere is one shaft 14 and one pin-setting linkage toreach'lltnneral key'h'aving a significant digitthereon.

The pins oxrsa'idmembers 18 are normally to the rear of the paths ofthe bars 16, and

are. brought into p'ositionto be set thereby by suitable denbmination-selecting means, which will cal'lse the denominational members ltl tobe advanced seriatim to positions to permit pin-setting. This denominationselect'm'g means may be snbstantially the same as that disclosed in the'patent to'Hart, No. 1,287,301, granted December 10,-1918, and comprises rods'or thrust links 19, which, when actuated, will swing eorresp'onding levels 20 abonttheir pivots. and, by means of transposition linkages .21 and bell-cranks 22 engaging pins -l3on the respective cle' nominational members 18, advance the latter to pin-setting positions.

After a number has been indexed on the pins 17 of the proper pin-bars or denominational members 18, a motorstarting key 24 may be depressed against the action of a spring 25 to swing a lever 26 about its pivot 37 to depress the right-hand end of alever 28. thereby lifting a motor-trip pin 29 and releasing the motor. whieh. by means of a member 30 projecting into a yoke 31 on the general o iierator 32. will cause. the latter to be reeiprorated. llpon forward movement of the general operator. bar 33 roirslituting a part thereof will engage the depressed pins lT and arluale lhe denominational members 1%. and. therefore. register or numeral Wheels Ill in accordance with the pins indexed. the result oi the computation being read through sight opening 3.1 During the return movement of the general operator. the pin bars 18 will be restored t their normal positions and 'thedepressed pins will be reset in "the usual manner. Actuation of the lever 28 to lift the motortrip pin 29 may also be effected by means of a vertically movable slide or device. 36,

having a pin 37 thereon beneath the for wardly extending arm of a lever 38, urged by a spring (not shown) to actuate said slide and normally held against such spring b means of a ltllClkllleHlbQt 39. The coir neetions for starting the motor may be in general the same as those disclosed iirthe co pendingapplication of Carl E. No'rin, Serial No. 309,836, filed July 10, 1919, (now Patent No. 1,370,475, dated March 1,1921) and lllQIIlOlLOl controlled by the "pin 29,15 well as the connection between the motor andthe generaloperator, may be sllbs't'an tially the same as in the patent to Alfred'll. \Vood, No. 1,299,646, granted Apri18,'1919.

it should be nnderstoodthat more than one register comprising wheels '34 may be provided,a set ofpin-bars and denomina Lion-selecting meeh'anism being associated with each register but the pinsettingl'mlo ages beingcommon to all of the -sets df pin bars or denominational members 18.

Provision maybe made of subtraction set ling mechanism similar, in general, to'that disclosed in the patent to ldinton, 1,280,065, dated September 24, 1918. As herein disclosed, the depression-of a 'subtraction key 4E0 will move alink 41again'st theresistance of a spring '42, and, bymea'ns ofan arm 43, fixed on a shaft 44, rock the latter to withdraw a hook 15'fmmen'gagement 'with a shoulder 46 on a 'snbtraction bar 4?,permittin the latter to bedraW'nto the'rear by a spring 48, connected thereto at one end and at the other e'ndto a fixed part'ol' the machine. Such movem'ent'of the subtraction bar '47 will lfect, through a bellerank 459 and arr-arm 50, connected toa bar 51 pivoted near'its upper edge,'r'o'cking of har 51, and consequently \vill'shlft the shafts 14 to change the connection between the arms 15 and the piirsettin'g linkages. As a result otthis change,'the shafts 1"1. when rocked, will actuate the pin Settin'g linkages which are complementary,"to the base nine,to the linkages actn'atedthereby when the. shafts 11 are in their normal eer tions, The rearward'aiiovementof suhtrae. lion bar 47 will also etlecl, through connec liens. not shown. depression of all of'lhr 8 pins. by means of a bar 52. As is well linuun to those skilled in the art, the parts are non' positioned to enable indexinga iznmlier for subtraction by the eompleineiital method.

ln case. an error is madedn indexing a ninnlrer on pins 17. it may be'klesirable to restore all of the indexed pins to their nor mal p sitions. to enable lhe number to be indexed rorreetly. lhis may be done by de "lflll elimination key 53 spring 54. The key pressing an error or against the action of a 53, when depressed, rocks a member 55 about a shaft or pivot 56, and, by means of a link 57, attached at its forward end to an arm 58 on said member 55, and at its rear to a slide 59, moves said slide to the rear, against the action of a spring 59*, and effects a restoration of the erroneously indexed pins to normal position by means similar to that disclosed in the atent to Walsleben, No. 1,255,828, dated February 5, 1918.

The pin-restoring platform 60 may be supported at each end by bell-cranks 61, those at the front being connected to those at the rear by means of a link or links 62, and downward movement of the pin-restoring platform being limited by means of an arm 63, movable with the forward bellcranks 61 and engaging, when the pin-re storing platform is in its lowest position, a member 64 bent-lath the pin-restoring platform and connected thereto. The slide59 is supported at its rear tending through a 'slot 66 in a bracket 67, mounted on a fixed part of the machine. When the slide 59 is'moved to the rear, it will tension a spring 68, connected to the pin and to the downwardly-extending arm of a bell-crank 69, pivoted at 70 on the bracket 67, and, as the slide 59 approaches the rearward limit of itsmovement, a pin 71 thereonwill engage the downwardly-extending arm of a latching bell-crank 72, swinging the upper arm thereof out of the path of a stud 73 on thebelLcrank 69, thereby releasing the latter to the action of the spring 68, which will swing the bellcrank .69 in counter-clockwise direction and cause its rearwardly-extending arm to engage .a pin 74 on one of the rear bell-cranks (t1, thereby effectin upward movement of the pin-restoring p atform 60. The latclr ing bell-crank is normally held in its effective position against aipin '75, by any suitable means,"such as a spring.

As will be seen frdm inspection of Fi ure 2, the pin-restoring platform 60 is provided with downwardly-inclined ends, so that, in case the general operator is actuated when the pin-restoring platform is held in its upper position by the spring 68, the bar 33 of the general operator will cam the pina'e storing platform downwardly so as to pass thereover.

Before starting a new computation, it is customary to test the cleared condition of the machine by means of a star or clearance key 76. Such key 7G,whcn depressed against the action of spring 54 corresponding to that associated with the error kc 53. will actuate an arm 77 fixed on shaft 56, and thereby swing an arm or latch 78. fixed on said shaft. against the action of a spring end by a pin 65, ex

78, out of the path of a to permit suitable means, such as a spring, to swing an arm 82, to which link 80 is con nected, about a shaft or pivot 83, to actuate a star or clearancesign-printing device. The counterclockwise movement of arm 82 about the shaft 83 will cause, by means of a link 84, depression of a lever 85 corresponding in general to the numeral-key levers, and, by means of a usual bell-crank 86, swing a typebar 87 about a piv0t 88 to eli'ect prmtin on a work-sheet on a platen (not shown) by means of star or clearancesign types 89.

In order that the printing of the star or clearance sign may correctly indicate that the totalizerjs cleared, it is usual to provide mechanism such as that disclosed in the patent to Hoyt, No. 1,256,399, dated -;February 12,1918, whereby depression of the star key will be prevented unless all of the. numeral wheels are set at zero. It will also be evident that all of the indexing ,pins 17 must be in their normal positionsat'the beginning of a computation. To that end, the member 55, normally actuated bythe error key, has an offset portion 90, having at its right an ear 91 loosely embracing the shaft 56, and the offset, portion is provided with a lug 92 extending beneath thearin 77, so that depression of the star, key 76 will effect swinging of member 55, and, consequently, an upward-movementofthe pinrestoring platform 60, to restore t'onormal position any of the index pins 17 which may be in depressed position. star or clearance sign will, therefore, iIidicate that the machine is in conditiontofstart a new computation. I i 1 i The numeral keys, 11 may then be do pressed to index numbers, as hereinbefore described. In order. to prevent the dep'res sion of more thanone numeral key at a time, provision may be made of an intrui; ing member 93 pii oted oneach pendant 12. so that when any numeral key is depressed. the intruding member 93, connected there with, will be projected between twoof a set of pivotally-mounted crowding members or dogs 94. the movement of which is limited by suitable means, such as screws 95, so that only one of said intruding members 93 may be depressed at one time. 4

In carrying out the invention. the righthand dog 94 is preferably provided with an arm 96 extending substantially horizontally from the pivot 97 of said dog. It will be evident that the weight of said arm tends to turn the dog 94,, with which it is conncctcd, in a clockwise direction, and. consesrquentl i'. to crowd the dogs 94 to the left. When however. any one of the numeral k ys 1] is depressed. the right-hand dog 9% will he forced to the right to its limiting posifiun in contact with screw 95, and the arm pin 79 on a link 80,

Printing the Lil normal position,

on shaft 113 so as 06 will be lifted so as to enter a notch 98 in a link 99, extending through an aperture 100 in the plate 101 on which the crowding dogs 04 are mounted. The link 99 will then Le loelrcd against rearward movement, and,

by means to he explained more fully hereinafter, will lock the error key 53 against depression. In its upward movement. the arm 96 will also lift the rear end of a lever 102 pivoted on shaft 83, and thereby effect movement or a latch-member 103, pivoted at 104, into engagement with a shoulder 105 onthc motor-trip key 24 and thereby lock the latter against depression. The operaiive connection between the lever 102 and latclrmcmber 103 may be effected by means of a in 106'on the latter, projecting into a suita ly-shaped cam-slot 107 in the forward end of the former. The' latch-member 103 may alsobe'pr'ovided with an arm 108 so sh'aped'that, wlijenthe latch-member 103 is moved into locking position, the arm 108 will assume af'position such as to obstruct the rearwardmovementof a pin 109 mounted on arm 78, and thereby prevent actua ion of'the latter by'the star key 76, and, consequently,prevent o ration of the starprinting mechanism. T 10 latch-member 103 may-"normally he held in its ineffective position by means of a spring 110, connected at one entlto a fixed part of the frame and at theotherfto said latch-member,

Upon depression of the error key 53 to restore any erroneously 'indexed pins'l'i' to a pin 111 on said key will engage an a'rm 112, fixed on a shaft 113, and lock the has in a clockwise direction, as seen in Fig'uie 1. In case of aplurality of registers, additional arms 112 may be fixed to be actuable by the pin 111 on the corresponding error key. By such rocking of the shaft 113, an arm 114 fixed thereon is swun to the rear and shifts rearwardly the linlr 99, the forward end of which is pivoted thereto at 115. so that the notch 98in the/link 99 is carried out of the path of the arm 96 on the rightrhand dog 94, thereby preventing a lifting movement of said arm 96, by reason of the engagement of-the lower edge of link 99 with the upper edge of said arm 96, and, consequently, loclo ing the numeral keys against depression. The rearward movement of arm 114 will also effect. by means of a horizontal portion 111; thereof overlying the forward end of a lever 11?, rocking of said lever 11? about the shaft 83 against the action of a spring 118. In such downward movement of the forward end of lever 117, a Stud 119 thereon will engage the inclined front edge of the lately member 103 and swing the same to the rear to engage the shoulder 105 on the motor-trip key 2 4, thereby locking the latter against ilw pression. It will be evident also that Eli aim 108 will be rendered eliectivu at two same time to lock the star key 70 against depression. The lever 117 may be of such length that, when actuated by'the error key, its rearward end will be raised into engagement with a projection 120 on the motor-trip slide or key 36, thereby preventing the actuation of tlielatter either manually or by the usual' iiiitornatic means.

lVhenever it is desired to throw the gen eral operator into action, the motonti'ip key 24"n'1l1y he depressed thereby br nging its front edge 121, above the 'slioiil'dcr 10E) thereon, into engagement with the rear face of the latch-member 103,'to lock the latter against rearward movement, and, cons quently, to loci: lever 102 and lever 11? against actuation by 11 numeral key orthe error key, respectively. It will be seen also that the latch-member 103 will not be relea'sed by the lrey 24 until the latter has been returned to its normal position.

In case the slide 36 has been depressed t: actuate the'rnotontrip mechanism, the pie jection 120 on said slide 'e'ngages or is broughtirito proximity to the rearward end of lever 117 and will prevent actuation (if the latter by the error key 53-aslong asthe slide, is in its depressed position. As'sooi'i, however, as slide 36 is released, the error he may be depressed.

or reasons pointed out in said application of HenryL. Pitman, it is undesirablcto pez mit actuation of the error key (hiring the operation of the general operator or while the latter is out of its normal position; To that end, provision may be made of a hook. 122, pivoted preferably on the same arises the rearward bell-cranks '61, and havin a rearwardly-extending ar'm 123 with-an, oiisct 124 normally in engagement with thrice-@1- face of a side bar 125 of the general operator 32, whereby the hook 122 will be maintained in ineffective position.

As the general operator 32 moves forward, the portion of the side bar 125 overlying the offset 124 will ride off the same, and permit the hook 122 to swing forwardly and engage the rearward end of the lever 117, thereby locking the error lcey against depression Shifting of the hook 122 to release the lever 117 will not be efiected until the general operator again approachesits original position, when the proper portion of the side bar 125 will ride over the offset 12% and restore the hook 129 to its normal inefi'ectire position.

As herein disclosed, provision is made or the usual shaft 126 by which manual opera tion of the general operator may be effected in case the motor mechanism has been discolr nectcd therefrom, the handle 12? for operating sliitl shaft being indicated in dash lines on Figure 1. Driving connections between the shaft 120 and the general operator 32 may wonsist oi pinions llh meshing with 1 till racks on the side bars of the general operator, and with toothed sectors 129 fixed on said shaft 126. The shaft 126 is utilized in coir trolling certain parts of the computing inechanism, irrespective of whether it actuates the general operator or is actuated (hereby.

As herein disclosed, proper support of the rearward portion of link 9}) is insured by providing a boss 130 on said shaft 1:26, said boss having a cylindrical portion on which said link 99 may rest.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In combination, computing mechanism comprising numeral keys for controlling the same. a clearance key, a clearance-Si printing mechanism controlled by said clearance key, and means whereby depression of anyone of said numeral keys will prevent actuation of said printing mechanism.

In combination, computing mechanism comprising numeral keys for controlling the same, a clearance key, a clearance-signprinting mechanism normally urged to print, a latch normally restraining said printing mechanism, means whereby said clearance key mav release said latch, and means whereby depression of any one of said numeral keys will prevent actuation of said latch by said clearance key.

3. In combination, computing mechanism comprising numeral keys for controlling the same, a clearance key, a clearance-signprinting mechanism normally urged to print, a latch normally restraining said printin mechanism, means whereby said key may shift said latch to ineftion, a device shiftable to a position to block movement of said latch. and means whereby depression of a numeral key will cause movement of said device to effective position.

4. In combination. computing mechanism comprising numeral keys for controlling the same, a clearance key, a clearance-signprinting mechanism normally urged to print, a latch normally restraining said printing mechanism, means whereby said clearance key may shift said latch to ineffective position, a pivoted member shiftable to a position to block movement of said latch, and means whereby depression of a. numeral key will effect shifting of said pivoted member to efi'ective position.

5. In combination. computing mechanism comprising numeral keys for controlling the same, a clearance key, a clearancesignprinting mechanism controlled by said clearunce key, means whereby depression of any one of said numeral keys will cause the remaining numeral keys to be locked against depression, and means whereby the numeralkey-lockin means, when rendered eli'ective by depression of any one of said numeral keys, will prevent printing by said printing mechanism.

6. In combination, computing mechanism comprising numeral keys, devices in which numbers may be indexed in accordance with the numeralkeys depressed, and a general operator whereby numbers so indexed may be computed, motor mechanism for actuating said general operator, 3; motor-trip device, a motor-trip key for actuatin said motor-trip, device, and means where y the depression of any one of said numeral keys will lock said motor-trip key against actuation.

7. In combination, computing mechanism comprising numeral keys for controlling the same, a clearance key, a clearance-signprinting mechanism controlled by said clearance key, and means whereby depression of any one of saidnumeralkeys will lock said clearance key against depression.

8. In combination, computingmechanism comprising numeral keys, devices in which numbers may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbers so indexed may be computed, motor-actuated means for actuating said general operator, :1 motor-trip device, a motor-trip .key for actuatingsaid motor-trip device, a clearance key, printing mechanism controlled by said clearance key, and means whereby the depression of any one of the numeral keys will lock both said motor-trip. key and said clearance key against depression.

9. In combination, computing mechanism comprisingnumeral keys, devices in which numbers may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbers So indexed may be computed, an elimination key, elimination-key-actuated means whereby the index devices may be restored to normal condition, and means whereby depression of any one of said numeral keys will effect locking of said elimination key.

10. In combination, computing mechanism comprising numeral keys, devices in which numbers may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbers so indexed may be computed, motor-actuated means for actuating said general operator, a motor-trip device. a motor-trip key for actuating said motor-trip device, a latch adapted to cooperate with said motor-trip key and lock the same against actuation, and means where iiy the depression of any one of said nlnneral keys will shift said latch to ell'ectirc position.

it In combination. computing mechanism omprising numeral keys, devices in which numbers may be indexed in accordance with opei'at or,

(hr numeral keys ilqpressril, and IL gen ral n'liereliy numbers so indc. tl may be computed, niotor-actuatmi means for artu ating said general operator, a inotontrip device, a m ritor trip key for actuating said motor-trip device, a pivoted latch adapted to (o-operate with said motor-trip key and lock' the same against actuation, and

means any one of said \rhereby the depression of I to he numeral keys will cause said latch sung into etl'ective position.

125111 combination, computing mechanism com rismg numeral keys, devices in which i mun ers maybe indexezl in accordance with i trip devic g'fa motor-trip key for actuating the numeral keys depressed, and a general operator wherebynumbers so indexed may be computed, lllOtOldiCttliitBtl means or aetiuiting aidgeneral operator, a motorsaid motontripderice, a device made efieei of any i of the other numeral reysia means whereby said pre venting lien rendered eflective by aiir o:n ofi said niimeraljkeys, will effect locking of said motor-trip key.

-to prevent depression of any nqtor t rip key and inedev ice, when made effective by any one 0' said numeral keys, will cause said latch to be shifted to effective position.

14. In combination, computing mechanism com aris ng numeral keys, devices in which iuimieis may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbers so indexed may be computed, motor-actuated means for actuating said. general operator, a motortrip device. a motontrip key for actuating said motor-trip device, :1 latch adapted to cooperate with said motortrip key and lock the same against actuation, means to prevent th depression of more than one numeral key at a time, comprising intruding me|uhers actuable by said numeral keys .uul crowding dogs having a limited movement so thatlonly one of said intruding members; may, be inserted at one time, a member shi ftahle bv one of the end dogs and means whereby shifting of said meml er. due to actuation of a numeral lie}, will eti'i-ct loi-i, ing of said motortrip key.

15. In combination, wnuput mg iil f liiillli iill numeral key f ers so indexed may I ionipiisiug numeral hers, devices in which ntuiilim's may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbers so llidQXEdflifitlj be computed, means I eral operator, including a starting key, and means whereby depression of an A one of said numeral keys will eflect locking of said starting key.

for actuating saidgen ll 16. In combination, computing niecliinrisiu i comprising numeral keys, devices in .Wliich' numbers ma be iiidexed in accoidiincelir i th the numeral kej's depressed, anda gerierel operatorwhereby numbers so index'ed inay be computech means for act uatin' saidf generul' operator, including a starting key a membermovable into position to co-opei'atc with said-start ng key andprerent operation thereof, and means whereby depression of'a numeral key will cause said ,memberl to 'bc con puting' mecliaance withthe iiurneral'keysdege edffmd a general ope iit or whereby an dexed may b computed,me'ai is fi-pflactuirting said general operator, including-a start ing l e r,a latchrmember movable into position to ro operat'e with said startingkcyand prere t operation thereof, means whereby depression 'of inu' of said numerallreys will lock tlie others, romprisi'u'g intruding members actuable b said numeral keys and crowding dogs haying a limited movement so that only one of said intruding members IU:. be inserted at one time, and means whereby insertion ot' one of said intruding bej ndexed in accordance with members bet ween the crowding dogs, due to depression of uui'ueral key, will eife ct movement of suu'l latrh uremher to etl'cctire position it), in combination, computing meclun nism comprising numeral keys, dericrs in l which numbers may he indexed in accord-4 auce with the numeral keys depressed, and 1! general operator whereby numbers so in iii-god inn) he com 'iutcd, means for actuating said general operator, including a start my kid, a latclrmemlirr movable into posi due to actuation of a numera startinfikey. 1.

Det mechanism nclud ng numeral wheels, in:- Imeral keys, d vices in which digits ma numbers may bel run d t .si r r i d elimination device, and means w diireans'i'ncluding members connected with .sa df y Ito limit the movementof said dogs, so that .na 'on k. 1 ianumeral key will lock the elimination key,

said member will be moved to carry tion to co-operate with said starting key and prevent operation thereof, means whereby depression of one of said numeral keys \\'ill vlo'ck'the others, comprising intruding mom ivhereby shifting of said shiftable member.

l key, will move. latch-member to effect locking of said a combined typcrvriting and coin machine, in combination, coniput llEQ' y be indexed in accordance with the numeral keys depressed, and a general operator whereby I into said numeral heels'in accordance with the indexing in clearance key, a clearancee vice rendered effective by said clearance key, an elimination device for restoringsaid indexing devices to normal condition,an'elimination key to control said I hereby depression of'said elimination kev will lock clearance key.

21.1 In a computing machine, in combinaf iumeral keys, numeral-key-locking a set of locking dogs, and means only one-of said members may be inserted between 'saiddogs at any one time, an ehmi y, and means whereby actuation of oroperation of the elimination key will lock the n eral keys, compr sing an arm can r ed'b e of said dogs atone end of said set, anda longitudinally movable member actuable by said elimination key, said member being provided with a notch adjacent to said arm whereby actuation of the do carrying said arm will cause said arm to enter the notch and thereby lock said meanhr r and the elimination key against movement. or in case of actuation of the elimination key said notch away from the path of said arm, thereby effecting locking of said arm and consequently of the numeral keys.

' 22. In a computing machine. in ccn'ihina tion, numeral keys,- numeral-ke vlockin means including members connected \vitn said keys. a set of locking dogs. and means to. limit the movement of said dogs, so that only one of said members may be inserted between said dogs at. any onetime. an cliinination key, means whereby actuation of a numeral key will lock the elimination key, or operation of the elimination lacy will lock the numeral keys, comprising; an arm car riod by one of said locking dogs at one end ol' said set, a movable member normally posit i nrd to co-operate with said arm, a start in key for said machine, means whereby Clepression of said starting key will lock said moi-able member, and, render said dogs eti'ective to prevent depression of said numeral keys and means whereby actuation of said movable member due to depression of a numeral key will lock said starting key against actuation. {23. In av combined typcwriting and computing; machine, in combination, a clearance lie 1. clearance-sign-printing device 'normall-v urged to print, means including a; latch controlled by maintaining said device in ineffective condition, computing mechanism, a member by which the actuation of said computing mechanism is started, and a member adapted \vhcn shifted to effective position to movement of said latch to ineffective position, and to prevent movement of said startine member from its normal position. 24. In a combined typewriting and computing machine key. a ClHH'ZUICCSlQIl-P1ll'll3l11g device normaily urged to print, means including a latch controlled by the clearance key for maintaining said device in inefi'ecti ve condi-.

through said arm,

the clearance key for prevent 35 in combination,.a clearance lion, computing mechanism, a memberby which the actuation 'of said computing mechanism staited. and apivote'd member adapted, when effectively positioned, to present an armin position to engage a..- shoulder on said and another arm in the path of said latch to prevent movement of the latter to inefi'ective position. i

25. In combination. computing mechanism comprising nun c 'al keys for controlling the same. a clearance key, a clearancesign-printing n'iechanism controlled by said clearance key, means whereby depression of any one. of said numeral keys will cause-the remaining numeral keys to be locked against depression. comprising intruding members actuahle. by said numeral keys and crowding does having: a limited movement '90 that only one oi: said intrud be inserted at one time, a member shiftable by one of the end dogs, and means whereby shifting of said shiftable member due to actuation of a numeral key will lock said cl arance kcv.

'1 2G. in combination. computing mechaelimination key,

the others, comprising intruding members first-mentioned member, 1

whereby numbers so in-'- ing members may said, sa s :rctnable by said numeral keys and crowding having a limited movement, so that only onecf said intruding members may be insertedat one time, and a locking device including amemher operable by said elimination key anda member shiftable by one of the end dogs upon depression of a numeral key to cooperate with said eliminatiqn key-operated member to prevent actuation thereofiandthcrehy to lock the eliminet nk y- 2'1, In combination, computing mechzr nism comprising numeral keys, devices in whiclnnnrnhers may be, indexed in accordance witlnt-he numeral keys depressed, and a general op'erator whereby numbers so indexed may be computed, an elimination key, elimination-hey actuated means whereby the dogs I de gjdevices may be restored to normal conin n, means whereby depression of any one numeral keys will effect locking of the; others, comprising intruding, members actuableby said numeral keys and crowdi dogs having a limited movement, so that buy one ofrsaid intruding members may 1 j'rrserted'atpne time, and clocking device ineluding a member actuable by one of said end dogs 'whena numeral key is depressed, and a. memherrnovable by, said elimination key, the ,arran ement and construction of being such that either one, when moved to actuated position, will pret movement of the other.

28', In combination, computing mecha- [nisincpmpris ng numeral keys, devices in whichmumbers may be indexed in accorda nce .with the numeral keys depressed, and a. general operator whereby numbers so inde ged may be computed, an elimination key, elimination-key-actuated means whereby the index devices may be restored to normal condition,ineans whereby depression of any one of saidmumeral keys will effect locking of the others, comprising intruding members actuable by said numeral keys and crowding dogs having alimited movement so that only one of said intruding members may be in sertedat one time, and a. locking device including a membermovable by said elimination key and a member movable by one of the end dogs, these two members being mounted to move in intersecting planes. one of said members being provided with a recem adapted to receive a portion of the other, movement of the first member, to carry the recess therein out of the path of the second, serving to lock the second, and movement of the second to cause said portion to enter the recess in the first serving to lock the first.

29. In combination, computing mechanism comprising devices in which numbers may be indexed and a general operator whereby numbers so indexed may be computed, actuating means for said general op- 30. In combination, computing mechanism comprising devices in which numbers may be indexed and a general operator whereby numbers so indexed may be computed, motor-actuated said general operator,

means for actuating a motoutrlp device,

a member by which said motor-tripdevice may be operated, an elimination key, elimiiintion-key-actuated means whereby the index devices may be restored to normal condition, a clearance key, a clearancessignprinting mechanism controlled by said clear- :lnce key, and means whereby actuation of said elimination key, will prevent operation of said motor-trip device by said;member and will prevent actuation of said clearance key. 1 i

31, In combination, computing meehanism comprising devices in which numbers may be indexed. and a general operator whereby numbers so indexed,'may be computed, motor-actuated means fouactuating, said general operator, a motor-trip device, a member by which said motor-tripjdevice may be operated, a clearance key, a, clearance-sign-printing mechanism controlled by said clearance key, an elimination key, and elimination-key-actuated means whereby the index devices may be restored to normal condition, including means for locking said member and said clearance key against movement.

32. In combination, computifllnechanism comprising devices in whie umbers may be indexed and a general operator whereby numbers so indexed may be computed, motor-actuated means for actuating said general operator, a motor-trip device, a member by which said motor-trip device may be operated, a clearance key,acl ear- ZlIICQSlg'lI -printing mechanism normally urged to print, clearancekey-controlled means normally holding said printing mechanism in ineffective condition, including a latch member, an elimination key, an eliminntion key-actuat-ed means whereby the index devices may be restored to normal condition, and a member controlled by said limination key, so that upon operation of the elimination key, it will be moved into position to lock both saidmolor-trip mem be r and said latch against movement.

.lI'i, In combination, computing mechanism comprising devices in which numbers may be indexed and a general operator whereby numbers so indexed may be computed, motor mechanism for, actuatingsaid Ill iii

'gcner l operator,-

,enmtor-trip device, a key to opt-rate saidmotor-trip derice directly, a second key, a lever actuable by said second key and positioned to engage the motor-trip device to act unto the same, a clearance key, a clearancc-sign-printing means controlled by said clearance key, an elimination key, and elimination-key-actuateiil means whereby the index devices may be restored to normal condi ion and both of the RlOtOldlll) keys and the clearance key locked against movement.

34. In combination, col'nputing mechanism comprising numeral keys, devices in \\i=.iclininnhers may be indexed in accorilmice with the numeral keys depressed, and a general operator whereby numbers so indcxcd may be computed. uiotor mechanism for actuating said general operator, a motortri-p kry for rendering said motor nicclnn nism ell'cctive, and means whereby depression of any one of said numeral keys will lock said motor-trip key against actuation, and depression of said motor-trip key will lock all of said numeral keys against depression.

35. In combination, computing mechanism comprising numeral keys, devices in which numbers may be indexed in accordalive with the numeral keys depressed, and a general operator whereby numbeis so indexed may be computed, motor mechanism for actuating said general operator, :1 motortripkey to render said motor mechanism effective, a clearance key, printing mechanism controlled by said clearance key, and means whereby depression of any. one of the numeral keys will lock both said motor trip key and said clearance key against deprcssion, and depression of .said motor-trip key will lock all of said numeralkeys and said clearance key against depression.

36. In ;combination," computing macl1anism comprising nu ncral keys, devices in which numbers may be indexed in accordance with'the numeral keys depressed, and a general operatorwhereby numbers so indexed may be computed, an elimination key, climination-key-actuated means whereby the index devices may be restored to normal condition, and means whereby depression of any one of said numeral keys'will effect locking of said elimination key, and depression of said elimination key will look all of said numeral keys.

37. In combination, computing mechanism comprising numeral keys, devices in which numbers may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbers so indexed may be computed, motor mechanism for actuating said general operator, a motor [rip key for controlling said motor mechanism, a latch adapted to cooperate with said nmior-lrip i(l and lock the same against actuation, and HlCililS whereby depression of any one of said numeral kc s will shift said latch to effective position, and depression of said inotortrip key will lock said latch against'shifting and thereby lock all of said numeral keys.

38. In combination, computing mechanism comprising numeral keys, devices in which numbers may be indexed in accordance with the numeral'keys depressed, and a. general operator whereby numbers so indexed may be computed, motor mechanism for actuating said general operator, :1 motor-trip key for controlling said motor mechanism, a pivoted latch adapted to co-operate with said motor-trip key and lock the same against actuation, and means whereby the depression of any one of said numeral keys will cause said latch to be swung into effective position, and depression of said motortrip key will lock said latch and consequently all of said numeral keys against actuation.

39. In combination. computing mechanism comprising numeral keys, devices in'which numbers may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbers so indexed may e computed, motor mechanism for actuating said general operator, 2. motor-trip key for controllin said motor mechanism, a device made e ective' by the depression of any numeral key'to prevent depression of any of the other numeral keys, and means whereby said preventing device when rendered effective by any one of saidnumeral keys will effect ,lOClflIlg of said motor-trip ke and depression of "said motor-trip'j key wi l render said device effective to'prevcnt depression o f any of the numeral ke'ySLj 40. In combination,'computingriiecliani'sm comprising numeral keys, devices i'n" which numbers maybe indexed in accordance with the numeralkeys'depre'ssed, and a general operator whereby numbers So indexed may be computed, motor mechanism for actuating said general operator, 3. motor-trip key for controlling said motor mechanism, a device made effective by' the depression of nny numeral key to prevent depression'fof' any of the other numeral keys, a latch to cooperate with said motqr-trip key and lock the same against actuation, and means whereby said preventing device when made effective by any one of said numeral ke will cause said latch to be shifted to effective position, and depression of said motortrip key will lock said latch in its normal position, and thereby render said preventing device effective to prevent depremion of any of said numeral keys.

41. In combination, computing mechanism comprising numeral keys, devices in which numbers may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbcis so indexed may Ill ill

10 be computed, motor mechanism for actuating said general operator, a motor-trip key for controlling said motor mechanism, a latch adapted to co-operate with said inoton trip key and lock the same ainst actua tion, means to prevent the depression of more, than one numeral key at a time, comprisin intruding members actuable by said numeral keys and crowding dogs having a limited movement so that only one of said intruding members may be inserted at one time, a member shiftable by one of the end dogs. and means whereby shitting of said member due to actuation of a numeral key will effect locking of said motor-trip key. and actuation of said motor-tri .key will lock said member against slii ting, and thereby reudersaid preventing means effective to prevent the depression of any of said numeral keys. 1 i i 42. In combination, computing mechanism comprising numeral keys, devices in which numbers may be indexed-in accordance with the numeral keys depressed, and a'general operator whereby numbers so indexed may be omputed, motor mechanism for actuating said general operator, a motor-trip mechanism, a device toactuate said motor trip mechanism dinectly, a second device,

including a key, to actuate said motor-trip mechanism, a latch normally ineffective but adapted to bemovgad to efiz'ective, position to engage saidsecond moto r trip deviceand lock the same against actuation, a prgjeation on the first motor-trip device, a lever extending from front tonear with its rear. end adjacent the first motor tripdeyice and un derlying the projectibnthereon, and haying a projection adapted to engage said latch and actuate the same, an error key, errorkeyectuated means whereby theindex devices may be restored. to normal condition, and means whereby depression of said error key will rock said lever, to engage the projection on the first motor-trip device tr. prevent actuation thereof, and to shift said latch into effective position to lock the second motor-tri device.

123. In combination, computing mechanism comprising numeral keys, devices in which numbers may be indexed in accordance with the numeral keys depressed, and. av general operator whereby numbers so indexed. may be computed, motor mechanism for actuating said general operator, a motor-trip mechanism, a device to actuate said. motortrip. mechanism directly, :1 second device, including a key. to iu'tuate said uiotor trip mechanism, a. latch normally ineffective but adnplcd to be moved to effective position to engage Sitltl, second, motor-trip cevicc and lock thc same against actuation. a projection on the lirst motor-trip device, a lever extend iug from from to rear with its rear end adjaccni the lirst motoi lrip device and under a, nuv vuv lying the projection thereon. and having a projection adapted to cngagc said latch and actuate the same, a clearance key, a clearance-sigirprinting mechanism controlled by said clearance key, means whereby said latch, when moved to ellcctive position, will lock said clearance key, an error key, errorkey-actuated means whereby the index devices may be restored to normal condition, and crror-ke v-actuatcd means for rocking said lever to cause the rear end thereof to engage the projection on the first moton lri'p key to prevent actuation thereof, and to shift said latch to lock the second motontrip key and the clearance key.

44. In combination, computing mechanism comprising numeral keys. devices in which numbers may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbers so indexed may be computed, motor mechanism for actuat ing said general operator, a motor-trip mechanism, a deviceto actuate said motortrip mechanism directly, a second device, in cluding a key, to actuate said motor-trip mechanism, a latch uoru'nilly ineffective but adapted to be moved to cliective position to engage said second motor-trip device and lock the same against actuation, a projection on the first motor-trip device, a lever extending from front to rear with its rear end adjacent the first motor-trip device and underlying the projection thereon, and having a projection adapted to engage said latch and actuate the same, a clearance key, a clearance sign 4 printing mechanism controlled by, said clearance key, means Whereby, said latch, when moved to effective posi tion, will lock said clearance key, a rockable member overlying the forward end of said lever, a link attached to said rockable memher, a nunieml-key-lock rendered 'fe fiective when said link is shifted by said rock-able member, an error key, and an error-keyacuated means for actuating said rockablc member to effect locking of the numeral keys by means of said link and locking of the two motor-trip devices and the clearance key by means of said lever.

45. In combination, computing mechanism comprising numeral keys, devices in which numbers may be indexed in accordance with tbc nnu1eral:keys depressed, and a general operator whereby numbers so indexed may be computed, general operator actuating means including a starting key to render the same eilectivc, an elimination key, elimination-key-controlled means whereby the index devices may be restored to normal condition. and means whereby depression of any one of said keys will lock the others against depression.

iii. in combination, compuling mechanism comprising numeral lu-ys, dcviccs in which nulnhcrs may lac indcxcd in n cordnncc with lll v of any one of, A

n means- .whe ebyrsaid l g V be cgmputed,

, devices may-be the movement of said latch, 'a re n dered.eliective by depression of any one key,, to sh ift ,sa

ling the sign-printing sion of a numeral-key,

ance key; againstdepression'.

1 key, .a clearance-Si themnmeral keys depressed, and a general operator \f\:ln: i ."eby, num beis so indexed may general-operatonactuating n cans ineludinga starting key to render the same ell'eetiye, aneliinination key, eliminatlon-keycont'rolled means ivheieby the index i I 4' restored to normal condition, a clearance ke a clearanoe-sigrr printing mechanism contrqllecl by said clearance k n ndvew n he ydepr i ele either a numeral key or the elimination key will A lock all the other keysagainst depression,

a11d depression oi thestartingkey will lock .the. numeral keys and the mination key against depression;

47. In combination,computing mechanism including numeral keys for controlling the same, a clearance ke a clearance-sigmprintmg meclnmism normally ,nrged to'prmt, a

,latch normally restraining said 7 printii1g m cha s m ns hereby sa gl euqe key may sl i ft said latch to inefiective positw h ey sh ftabl i Po i b a locking device of. the numeral keys i to V lock 'the others a n fiep e s o h an m a ctuate by snidlocking deyice whe'n the latter is rendered efi'ective. bygdepression of a numeral tive position.

. 48. In combi atign, compll ?i g mecha- ,nism comprising numeral keysfor. controlsame, a eleziranceikey, a clearance mechanism controlled by said clearance key,

' said numeralkeyswill lock the others, device, when renderedueffective by, de resxeilllock, said cl e r- 49. In 1 combination, jcornpntin mechanism comprising ,numeral keys, evices in which numbers may be indexedjnaccordance with the numeralkeys depressed, and a general operator whereby nnmbers so indexed may be computed, generaboperatoractuating means including for rendering the same effective, a. clearance n-printing mechanism controlled by said e earance key, alocking device whereby the depression of any one of the numeralkeys will effect locking of the others, and means whereby actuation of said numeral'key-locking device, clue to depression ofone of the numeral keys, will lock said clearance key and said starting key against actuation.

50. In combination, computing inechanism comprising numeral keys devxces in,

which numbers maybe' indexed in accord anre with the numeral-keys depressed, and

a general operator whereby numbers so in- LZQLL 1 may becomputcd. an elimination key. olimiuation-lu-y-aduated means whereby the tion in dex ed may 'be computed 'key,

idshrftabledfivice to GREG:

whereby the i1 deyi where y. depr s a startingkey 1 index devices may be restored to normal condition, locking means whereby depression of any {one of the numeral keys will lock the otheis, and means whereby actuaof said numeral-key-locking means, by anyy'on' of s'ai d numeral keys, will effect locking 7 of said' elimination key.

51. In combination, computing mechanism comprising numeral keys, devices in which numbers may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbers so a clearance clearance-sign-printing mechanism controllechby said clearance key, an elimina- Itioii kj", climinirtitnrkey-controlled means whereby the iiidcx devices may be restored to normal condition, means whereby depres sion of the elimination key will elfect locking of the clearance key, and means whereby depression of a numeral key 'will eli'ect locking of the clearance key.

52(Ii1 combination, computing mecha nism comprising numeral keys, devices in which nnn bers may be indexed in accordance with the numeral keys depressed, a general operator whereby numbers so indexed may be computed, a clearance key, clearaneesign-printin mechanism controlled by said clearance key, in elimination key, eIimination-key-controllerl means ex devices may be restored depresto normal cont ition, means whereby 'sipn ofi the elimination key will effect locl-:-

ing of the clearance key, means whereby depression of an uineral key will effect locking of the clea pm key, and means whereby depressionofja numeral key will efiect locking of s aicl elimination key.

v 53. In combination, computing mechanism comprising numeral keys,-devices in which numbers may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbers so indexed may be computed, a clearance key, clear :nce-sign-printing mechanism controlled by said clearance key, an elimination key, elirizinationkey-controlled means whereby the indexdevices may be restored to normal condition, means whereby depression of the elimination key will effect locking of the clearance key. means whereby depression of a numeral key will effect locking of the clearance key, and means whereby depressioniof said elimination key will effect locking of said nu meral keys Eli In combination, computing mechanisnrcomprisirig numeral keys, novices in which numbers may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbeis so indexed may eftmupuled. a clearance key. cleai'anccsign-printing mechanism controlled by said clearanu' key, an elimination kc climinalion-liry-mnlrolled means whereby the index devices may be restored to nor al condition, meagswhereby depres sion o l the elimination key will eli'ect lock ing of the clearance key, means whereby depression of a numeral key will effect locking of the clearance key, and means whereby movement of the general operator from its normal position will effect locking of said elimination key.

55. In combination, computing mechanism comprising numeral keys, devices in which numbers may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbers so indexed may he computed, a clearance key, clearancesigir printin mechanism controlled by said clear :mce key, an elimination key, elimination key-controllcd means whereby the index devices may be restored to normal condition, means whereby depression of the elimination key will effect locking, ot the clearance key, means whereby depression of a numeral key will efi'ect locking of the, clearance key, means whereby depression of a numeral key will effect locking of said eliminatiorrkey, and means whereby movement of the general operator from its normal position will effect lockin of said elimination key.

56. n combination, computing mechanism comprising numeral keys devices in'which numbers may be 'indexed'm accordancewith the numeral keys depressed, and a general operator whereby numbers so index ed may be computed, a clearance key, a clearancesign-printing mechanism controlled bysaid clearance key, an elimination kev elimination-key-controlled means wherebytheindex devices may be restored to normal condition? means whereby depression .of the'elimination' key will effect locking of'the: clearancekey," means whereby depression of a numeral key will effect locking of the clearance key,'means whereby depression of said elimination key will effect locking of said numeral keys. and means whereby movement of the general operator from its normal position wilL-eiiect locking of said eliminationkey.

57. In combination, computing mechanism comprising numeral keys. ',dcvices in which numbers may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbers so indexed may" be computed, a clearance key, clearance-signprinting mechanism controlled by said clearance key, an elimination key, elimination key controlled means whereby the index devices may be restored to normal condition, means whereby depression of a numeral key will ellect locking of said clearance key, and means whereby depression of the elimination key will eilect locking of the numeral keys.

5%. in combination, computing mechanism comprising numeral keys. devices in which numbers may or indexed in accordance with I key,

operator {whereby ,eso

the numeral keys depressed, and a general operator whereby numbers so indexed may be coniputed, a clearance key, clearance-signprinting mechanism controlled by said clearance key, an elimination key, elimination keyrontrolled means whereby the index (le vices maybe restored to normal condition, means whereby depression of said elimination keywill eflect locking of the clearance and'means whereby depression of any one of the'numeral keys will effect locking of the elimination key. I

59. In combination, computing mechanism comprising numeral keys, devices in which numbers may be indexed in accordance with the numeral keys depressed, and a general operator whereby numbers so indexed may beconiputed, a clearance key, clearance-signprin'tingmechanism controlled by said clearance key, an elimination key, eliminationkey-controlled means whereby the index devices may be restored to normal condition, means whereby depression of a numeral key will effect locking of means whereby depression of theelimination -key"will effect" locking of the" numeral} keys,

and means whereby moveinent-oiithe' general 'operat'or from -its normal position will effect lockin of-saidelimination k8yl 601" n combination, computing mechanism comprising numeral keys, devices irr which numbers may i be; indexed in accordafncewith the 'nu meralv keys depressed, and ageneral beeoinputed, a clearance key, clearance-signprmting riiechanism controlled-by said clearan 1 Elllfill'liitlon key, eliminationkey-cont rolled means whereby the'index- "de- 'yieesj may herestored to normal" condition,

means whereby depression of 'said' eliminat ion key will efiect'lockingoithefielearanoe key-,-means wherebydepression-of any one of the numeral" keys" will effect-docking of the ehrninatio'n' key; 1 and means"'w'hereby movement'of the general operator fi-oni its normal position i will effect lockingor said elimina- 61. In-combination, computing mechanism comprising numeral keys, devicesin which numbers may be'i'ndex'cd in accordance with the numeral keys depressed, and operating means whereby riumbersso indeked may be computed, anerror key, errofikey-actuated means whereby the index devices may berestored to normal condition, and means where: by depression of said error key will efi'ect locking of said numeral keys and the return of said error key to normal positionf will efl'ect release of said numeral keys.

HARRY H. vicltnns.

\Vitnesses:

Eorrrr B. LIBBEY, (la'rnrznmii A, Ni-zwrtiiL.

' said clearance key,

"numbers so indexedmay 

